Bitcoin devotees and other cryptocurrency fans say that math gives their radical ideas so much potential. But starting a new value system also requires a level of faith in the people using the math. As “shitcoin” scams pile up, it’s becoming clear that new currencies need trust, too. And they don’t have it.

When Jeff Pearlman, a sportswriter, wrote a recent column, he received his typical slew of hate, slurs and rude remarks on Twitter. But this time, he didn't want to ignore it. Instead, he sought out his "online haters" in real life.

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